I think long songs can be good.
Around 10 minutes isn't uncommon, even for non AI songs.
(AtSelfMore)
I wonder what makes something 'a song?
Albums have many songs put together, but many albums are a single story so to speak.
. . . The songs tend to have cutoff points I suppose, clear divides where the 'new song begins.
I wonder if there's any where the cutoff point 'isn't clear?
There's the music style, and the story. . .
So one could have a song of Angron walking on his homeworld with Lorgar, reminiscing of his 'true brothers and sisters.
Another song where Lorgar transforms Angron into a Demon Prince while Loyalist World Eaters and Lhorke attempt to stop it,
In a usual album that second song would end with Lhorke's death I think?
Or maybe a new song would 'start with Lhorke's death?
3rd song being one such as a more standard Angron as a Demon Prince.
But 'usually these three songs would either have different music styles, or even if in 'one music style, there would be 'moments, where one see's the new song begin because something new is happening in the story.
Though I suppose one could also just do it all in one style, and say it's one song.
Different styles though. . .
Maybe, Sad, Loyalty, and Doom.
A 'different way, one could make them one song though,
Is to move the style halfway into each song/narrative.
Sad starts with Doom music and fades into sad,
Loyalty starts with sad and fades into Loyalty,
Doom Starts with Loyalty and fades into Sad.
The trick would be for each song to have 'half their style, and half the style before.
Or half their style and half the style oncoming.
Hm, maybe it wouldn't work though.
Also, I imagine it can be tricky to 'slow transition into another style where it's difficult to notice where one ends and another begins.
Heh, besides, I think people would probably separate it into separate tracks anyhow.